On initial contact participants will be assessed as per normal practice by participating physiotherapists in the health centres or hospitals they would normally attend in an attempt to minimise disruption to the patient journey. It is hoped travel will be minimised for participants in order to minimise drop out and participant expense. In instances where diagnosis is uncertain participating therapists are advised to seek a second opinion from appropriate colleagues/senior clinical staff as they would do under normal circumstances. If a diagnosis of Achilles tendinopathy is still uncertain the potential participant will not be included and will be informed why. Participating therapists will undergo training in obtaining informed consent; diagnosing Achilles tendinopathy as defined in the following inclusion criteria; and receive instruction in data collection procedures required for this investigation from the principle researcher.